[mythtv-users] PVR-250: sound, NO video, no obvious errors

Joseph A. Caputo jcaputo1 at comcast.net
Thu Nov 20 12:18:46 EST 2003


On Thursday 20 November 2003 09:45, Joel Cooklin wrote:
> I can't figure out why through mythtv I don't get a picture.  When I
> playback the result of  '/usr/lib/ivtv/record-v4l2.pl -c 3 -t 1200 -D
> /stor/stage' I get a perfecet picture with sound.  However through
> mythtv I just a blank screen with sound.  There are no obvious errors
> being reported in dmesg, messages or on standard err of either the
> backend or frontend.  Probably related is the fact that I am also
> unable to get any kind of output through xawtv.  I would appreciate
> any help that could begin pointing me in the right direction.  Below
> is some information that may be helpful.  Thanks.
>
> [root at grace log]# mythbackend -v
> Starting up as the master server.
> 2003-11-20 07:24:58 Enabled verbose msgs : important general
> 2003-11-20 07:25:00 Found changes in the todo list.
> 2003-11-20 07:25:18 MainServer::HandleAnnounce Playback
> 2003-11-20 07:25:18 adding: grace as a player 1
> 2003-11-20 07:25:19 MainServer::HandleAnnounce Playback
> 2003-11-20 07:25:19 adding: grace as a player 0
> 2003-11-20 07:25:19 MainServer::HandleAnnounce Playback
> 2003-11-20 07:25:19 adding: grace as a player 0
> 2003-11-20 07:25:19 adding: grace as a remote ringbuffer
> 2003-11-20 07:25:19 WARNING:  Capture device /dev/dsp is not
> reporting full duplex capability.
> See docs/mythtv-HOWTO, section 18 for more information.
> 2003-11-20 07:25:19 Changing from None to WatchingLiveTV
> 2003-11-20 07:25:28 Changing from WatchingLiveTV to None
> 2003-11-20 07:33:26 MainServer::HandleAnnounce Playback
> 2003-11-20 07:33:26 adding: grace as a player 1
> 2003-11-20 07:33:26 MainServer::HandleAnnounce Playback
> 2003-11-20 07:33:26 adding: grace as a player 0
> 2003-11-20 07:33:26 MainServer::HandleAnnounce Playback
> 2003-11-20 07:33:26 adding: grace as a player 0
> 2003-11-20 07:33:26 adding: grace as a remote ringbuffer
> 2003-11-20 07:33:26 WARNING:  Capture device /dev/dsp is not
> reporting full duplex capability.
> See docs/mythtv-HOWTO, section 18 for more information.
> 2003-11-20 07:33:26 Changing from None to WatchingLiveTV
> 2003-11-20 07:33:36 Changing from WatchingLiveTV to None


Well, you didn't give any system specs, but I'm assuming you have a 
PVR-250/350, since you're using ivtv.  If that's the case, first of all 
you can't use xawtv to test it, as xawtv is only for V4L cards.  If 
you're recording from a PVR-x50 it shouldn't be trying to open /dev/dsp 
as a capture device, as the audio & video are already multiplexed into 
an MPEG stream on /dev/videoXX.  It sounds like you chose the wrong 
tuner card type when you ran the backend setup program -- you should 
have chosen "Hardware MPEG card" *NOT* "Standard V4L or Hardware 
MJPEG" (note the 'J' -- "MPEG" != "MJPEG").  Re-run the backend setup 
and make sure you choose the correct card type.

-JAC



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